/**
 *    Copyright ${license.git.copyrightYears} the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.mybatis.generator.codegen.ibatis2.dao.elements;

import java.util.Set;
import java.util.TreeSet;

import org.mybatis.generator.api.DAOMethodNameCalculator;
import org.mybatis.generator.api.IntrospectedColumn;
import org.mybatis.generator.api.dom.java.FullyQualifiedJavaType;
import org.mybatis.generator.api.dom.java.Interface;
import org.mybatis.generator.api.dom.java.JavaVisibility;
import org.mybatis.generator.api.dom.java.Method;
import org.mybatis.generator.api.dom.java.Parameter;
import org.mybatis.generator.api.dom.java.PrimitiveTypeWrapper;
import org.mybatis.generator.api.dom.java.TopLevelClass;

/**
 * 
 * @author Jeff Butler
 * 
 */
public class InsertMethodGenerator extends AbstractDAOElementGenerator {

  public InsertMethodGenerator() {
    super();
  }

  @Override
  public void addImplementationElements(TopLevelClass topLevelClass) {
    Set<FullyQualifiedJavaType> importedTypes = new TreeSet<FullyQualifiedJavaType>();
    Method method = getMethodShell(importedTypes);

    FullyQualifiedJavaType returnType = method.getReturnType();

    StringBuilder sb = new StringBuilder();

    if (returnType != null) {
      sb.append("Object newKey = "); //$NON-NLS-1$
    }

    sb.append(daoTemplate.getInsertMethod(introspectedTable.getIbatis2SqlMapNamespace(),
        introspectedTable.getInsertStatementId(), "record")); //$NON-NLS-1$
    method.addBodyLine(sb.toString());

    if (returnType != null) {
      if ("Object".equals(returnType.getShortName())) { //$NON-NLS-1$
        // no need to cast if the return type is Object
        method.addBodyLine("return newKey;"); //$NON-NLS-1$
      } else {
        sb.setLength(0);

        if (returnType.isPrimitive()) {
          PrimitiveTypeWrapper ptw = returnType.getPrimitiveTypeWrapper();
          sb.append("return (("); //$NON-NLS-1$
          sb.append(ptw.getShortName());
          sb.append(") newKey"); //$NON-NLS-1$
          sb.append(")."); //$NON-NLS-1$
          sb.append(ptw.getToPrimitiveMethod());
          sb.append(';');
        } else {
          sb.append("return ("); //$NON-NLS-1$
          sb.append(returnType.getShortName());
          sb.append(") newKey;"); //$NON-NLS-1$
        }

        method.addBodyLine(sb.toString());
      }
    }

    if (context.getPlugins().clientInsertMethodGenerated(method, topLevelClass, introspectedTable)) {
      topLevelClass.addImportedTypes(importedTypes);
      topLevelClass.addMethod(method);
    }
  }

  @Override
  public void addInterfaceElements(Interface interfaze) {
    Set<FullyQualifiedJavaType> importedTypes = new TreeSet<FullyQualifiedJavaType>();
    Method method = getMethodShell(importedTypes);

    if (context.getPlugins().clientInsertMethodGenerated(method, interfaze, introspectedTable)) {
      interfaze.addImportedTypes(importedTypes);
      interfaze.addMethod(method);
    }
  }

  private Method getMethodShell(Set<FullyQualifiedJavaType> importedTypes) {
    Method method = new Method();

    FullyQualifiedJavaType returnType;
    if (introspectedTable.getGeneratedKey() != null) {
      IntrospectedColumn introspectedColumn = introspectedTable.getColumn(introspectedTable.getGeneratedKey()
          .getColumn());
      if (introspectedColumn == null) {
        // the specified column doesn't exist, so don't do the generated
        // key
        // (the warning has already been reported)
        returnType = null;
      } else {
        returnType = introspectedColumn.getFullyQualifiedJavaType();
        importedTypes.add(returnType);
      }
    } else {
      returnType = null;
    }

    method.setReturnType(returnType);
    method.setVisibility(JavaVisibility.PUBLIC);
    DAOMethodNameCalculator methodNameCalculator = getDAOMethodNameCalculator();
    method.setName(methodNameCalculator.getInsertMethodName(introspectedTable));

    FullyQualifiedJavaType parameterType = introspectedTable.getRules().calculateAllFieldsClass();

    importedTypes.add(parameterType);
    method.addParameter(new Parameter(parameterType, "record")); //$NON-NLS-1$

    for (FullyQualifiedJavaType fqjt : daoTemplate.getCheckedExceptions()) {
      method.addException(fqjt);
      importedTypes.add(fqjt);
    }

    context.getCommentGenerator().addGeneralMethodComment(method, introspectedTable);

    return method;
  }
}
